/*
 *  Create the splitter, set the viewport size, and set the position of the scrollbar to the first item.
 */
Drupal.behaviors.calendarSetScroll = function (context) {

  // Make multi-day resizable - stolen/borrowed from textarea.js
  $('.header-body-divider:not(.header-body-divider-processed)').each(function() {
    var divider = $(this).addClass('header-body-divider-processed');
    var start_y = divider.offset().top;

    // Add the grippie icon
    $(this).prepend('<div class="grippie"></div>').mousedown(startDrag);

    function startDrag(e) {
      start_y = divider.offset().top;
      $(document).mousemove(performDrag).mouseup(endDrag);
      return false;
    }

    function performDrag(e) {
      var offset = e.pageY - start_y;
      var mwc = $('#multi-day-container');
      mwc.height(Math.max(0,mwc.height() + offset));
      start_y = divider.offset().top;
      return false;
    }

    function endDrag(e) {
      $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
    }
   });

  $('.single-day-footer:not(.single-day-footer-processed)').each(function() {
    var divider = $(this).addClass('single-day-footer-processed');
    var start_y = divider.offset().top;

    // Add the grippie icon
    $(this).prepend('<div class="grippie"></div>').mousedown(startDrag);

    function startDrag(e) {
      start_y = divider.offset().top;
      $(document).mousemove(performDrag).mouseup(endDrag);
      return false;
    }

    function performDrag(e) {
      var offset = e.pageY - start_y;
      var sdc = $('#single-day-container');
      sdc.height(Math.max(0,sdc.height() + offset));
      start_y = divider.offset().top;
      return false;
    }

    function endDrag(e) {
      $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);
    }
   });

   // Size the window
   calendar_resizeViewport();
}

// Scroll the viewport to the first item
function calendar_scrollToFirst() {
   if ($('div.first_item').size() > 0 ) {
      var y = $('div.first_item').offset().top - $('#single-day-container').offset().top ;
      $('#single-day-container').scrollTop(y);
   }
}

// Size the single day view
function calendar_resizeViewport() {
  // Size of the browser window
  var viewportHeight = window.innerHeight ? window.innerHeight : $(window).height();
  var top = $('#single-day-container').offset().top;

  $('#multi-day-container').height(75);
  // Give it a 20 pixel margin at the bottom
  $('#single-day-container').height(Math.max(400,viewportHeight - top - 20));
}